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Symptom: P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH When Monitored and Set Condition: P0123-THROTTLE POSITION SENSOR VOLTAGE HIGH When Monitored: With the ignition on and battery voltage above 10.4 volts. Set Condition: The throttle position sensor signal voltage is above 4.94 volts. POSSIBLE CAUSES PCM - 5-VOLT SUPPLY CIRCUIT PCM - TP SENSOR SIGNAL CIRCUIT INTERMITTENT CONDITION TP SENSOR SIGNAL CIRCUIT SHORTED TO THE 5-VOLT SUPPLY CIRCUIT VERIFY TP SENSOR OPERATION 5-VOLT SUPPLY CIRCUIT SHORTED TO VOLTAGE TP SENSOR SIGNAL CIRCUIT OPEN PCM SENSOR GROUND CIRCUIT OPEN TP SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE TP SENSOR OPEN PCM - SENSOR GROUND OPEN TEST ACTION APPLICABILITY 1 Turn the ignition on. All Yes → No → 2 Turn the ignition off. All Yes → No → 52 DRIVEABILITY - DIESEL |